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Blackthorn is a cross-bred plant added by Industrialcraft 2. It can be obtained only by cross-breeding. When harvested, it drops Ink Sacs. It can only be cultivated inside a Crop. As with all crops from IndustrialCraft 2, it can be bred to improve its stats.

It has four growth stages, the first three being identical to the same stage of other flowers such as Cyazint or Roses. As with all IC2 flowers, it requires high air quality to grow - this means having a large amount of open air above it, and ideally it being able to see the sky. Air quality is also affected by other nearby blocks.

Left clicking at the highest growth stage will destroy the plant and yield seed bags as well as harvest Inc Sacs. Right clicking at highest stage may harvest Inc Sacs.